Writing instrument



FIG. 1 is a front elevation view of a writing instrument according to the new design.

FIG. 2 is a side elevation view thereof, from the left side in FIG. 1.

FIG. 3 is a rear elevation view.

FIG. 4 is a side elevation opposite from FIG. 2.

FIG. 5 is a top end view.

FIG. 6 is a bottom end view; and,

FIG. 7 is a perspective view. 

The ornamental design for a writing instrument, as shown and described. 